Solution : https://service.sap.com/sap/support/notes/788470 (SAP Service marketplace login required)
Key words : 
recipe management -> formula -> valid specification types, valid specification types, invalid specification types, attached correction instructions, invalid specification type, error message stating, recipe workbench, specification type, program error, substance disappears
Related Notes : 
       
| 769207 | RMGMT210: Corrections in Support Package 08 | 
| 647909 | Missing check of the specification type |